Square.



F. L. & E. T. BOQNE.

SQUARE.

APPLICATION FILED .IULY Il. 1914.

lllllm Patented Mar. 21, 1916.

THE COLUA\BIA PLANOGRAPH co., WASHINGTON, D. c,

FRANK L. vBoom: AND ELI T. BOONE, or GREENsBoRo, rnNNsYLvANIa.

v SQUARE.

To all 'whom it may concern Be it known that we, FRANK L. BOONE and ELI T. BOONE, citizens of the United States, residing at Greensboro, in: theY county of Greene and State of Pennsylvania, have invented new and useful Improvements in Squares, of which the following is a speciication. f

This invention relates to a square for use by carpenters and builders, the primary object being to provide a square which is of the ordinary construction, but which is provided with scales graduated on its faces by the use of which a carpenter may determine the run of a roof readily by simple computations, when the rise and angle of the roof are given, or may determine the rise when the run and angle of inclination are given.

The invention consists in the features of construction, combination, and arrangement of parts, hereinafter fully described and claimed, referencebeing had to the accompanying drawing, which represents:

A side elevation of a square graduated in accordance with the invention.

The square is constructed in the manner shown with its short leg 1 arranged at right angles to the long leg 2. Longitudinal lines 3 and 4 are inscribed medially upon the legs l and 2 respectively, and intersect each other at right angles at the point 5. A scale of linea-r measurement is provided coeXtensive with each of said lines and reads from the point 5, each scale being graduated preferably in inches and fractions thereof. A degree scale is provided upon the long leg of the square by the graduated lines 6 which radiate from a common center 7, which latter is located on theline 3 at a distance of l2 from the point 5. The leg 2 of the square is approximately twice as long as the leg l so that the line 4 will be long enough to subtend an angle of 60.

The use of the device will now be described. Assuming that a carpenter is given instructions to build a house 24 wide havlng a. common roof rwhose angle of pitch is 15, the instrument may be used to give the risel in inches or feet in a very short space of time. It is known that the run of the roof will be l2 or one-half of 24. Referring to the angle scale of the Square, it will be seen that 15 thereon is subtended by a length of 34 on the altitude line 4, considering the line 3 as the base of the triangle Patent-ed Mar. 21, i916.

Application filed July 11, 1914. Serial No. 850,367.

in question. From this triangle, the carpenter may obtain the desired result by working a simple proportion equation. It is obvious that the desired rise of the roof in'inches is to the run as 35; is to 12, so we have the equation x 39g 14a-12' The result therefore is that :12:39 or 3 3, the rise of the roof. In this manner the rise of a roof having any angle of pitch up to may be determined readily, or the run may be found when the rise and angle are given. However, when a roof whose angle of pitch is greater than 60 is to be considered, the instrument may still be used in determining the rise or run, even though its angle scale does not exceed 60. In this instance, the line 4 is used as the base of the computing triangle and the line 3 as the altitude thereof. The length of the line 3, which is l2, now is the constant quantity and the 30 mark upon line 4 will correspond to the 60 mark in the original triangle. Therefore, assuming that the roof to be constructed has a rise of 6 and a pitch of 61, which are the only known quantities, the 29 mark upon the angle scale is referred to. This mark represents 30 minus 1, the reading being calculated now between the 30 point and 0, which latter is represented by the point 5. The 29 point, which corresponds to 61, coincides with 6g upon the base line of the triangle. It is therefore possible to obtain the equation mim What is claimed is: l' v Y v In a device of the kinddescrib'ed, in combination, a measuring member having tW legs, disposed atV right angles, one of said legs being twice the length of the other, each. of said legs being inscribed with a medial line, said lines being joined and divided respectively into twelve inches and twenty four inches by graduated measuring marks which are disposed toward the outer edges of the said legs, one of said lines having, opposite its respective measuring marks, desig nated indications representing various degrees of a circle, all oi said degrees not ex ceeding 60 degrees formingv a primary series of? designated markings inscribed vvseran/int upon lsaid longer leg, the markings for 60 "degreesf'up to'QO degrees beingindicated by vtheir co-sine values inscribed serz'at/m next adjacent to said primary series of markings Copies of this patent may be obtained for five cents each, vby addressing the Qommissionerof Patents,

Washington, D. C. Y 

